Pinpoint Test H: The Audio Volume Does Not Reduce When Parking Aid Tone Sounds

Parking Aid - Explorer

Pinpoint Tests

Pinpoint Test H: The Audio Volume Does Not Reduce When Parking Aid Tone Sounds

Normal Operation

With the ignition switch in the RUN position and the gear selector in REVERSE (R), the parking aid system calculates the distance to an object by the use of a radar sensor. A volume cutback request message is sent to the Audio Control Module (ACM) from the Parking Aid Module (PAM) over the Medium Speed Controller Area Network (MS-CAN) to decrease the volume of the ACM. The sounder increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 46 cm (18 in) of the vehicle, the warning tone becomes continuous.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- PAM
- ACM



PINPOINT TEST H: THE AUDIO VOLUME DOES NOT REDUCE WHEN PARKING AID TONE SOUNDS

-------------------------------------------------
H1 CHECK THE ACM CONFIGURATION


- Apply the parking brake.
- Place an object behind the vehicle within the range of the parking aid sensors.
- Ignition ON.
- Apply the brake pedal and place the gear selector in REVERSE (R).
- Enter the following diagnostic mode on the scan tool: ACM DataLogger.
- Monitor the parking aid input status PID (RPA_STAT) while the parking aid tone is sounding.
- Does the PID read "Enabled" while the parking aid tone is sounding?

Yes
GO to H3.

No
GO to H2.

-------------------------------------------------
H2 CHECK FOR COMMUNICATION WITH THE PAM


- Carry out the network test using the scan tool.
- Does the scan tool communicate with the PAM?

Yes
GO to H3.

No
REFER to Information Bus to diagnose no communication with the PAM.

-------------------------------------------------
H3 CHECK FOR CORRECT ACM OPERATION


- Disconnect the ACM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the ACM connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?

Yes
INSTALL a new ACM. REFER to Accessories and Optional Equipment. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

-------------------------------------------------